In this case, the unit is the affected storage processor sub assembly. It's 100% hot-swappable, but I'd recommend doing the swap at a quiet time as the replacement will temporarily affect array performance - and it obviously temporarily reduces redundancy. You should perform a couple of pre-checks before swapping a storage processor board. Check that the path balancing algorithm in VMware is set correctly (should be Round Robin or MRU) and for physical hosts, check that PowerPath is happy and reporting that paths are alive. If all that checks out OK, then the hosts will cope with losing a storage processor and LUNs will fail over correctly. You could also do a pre-emptive trespass of all LUNs on the faulty storage processor to its partner. To force a trespass (this is non-disruptive), right-click on the LUN in Unisphere or Navisphere and select Trespass.

Sorry - missed this bit: if the SFP fails, the array will continue to operate normally and whatever path balancing/path fail-over software you have will route FC frames down other paths to the arrays, but you've lost a level of redundancy and if you're working the array hard, you've potentially lost some performance too.

We all have limited time to study long and complicated information about RAID theories, but you may be interested as to how RAID 5 works. We made it simple for you by providing the shortest and easiest explanation ever.
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This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility.
Plug in the external drive you wish to encrypt:
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